Yea.. eventually, I figured it out the hard way (i.e., crossed fingers and hit the switch). Even though for some reason, OSC 1 wasn't playing when I turned the Voyager back on, and it didn't respond to volume changes in the mixer either. It started playing again only when I had the mod wheel all the way up (even w/ the modulation amount at zero). I triple-checked the signal path, and there was nothing that was supposedly causing this. Perhaps it was some of the software settings that the patch I modified had - I don't know.